I bought this stuff at Dollar Tree for a $1.00 a bottle, its made by Warren and I put a bottle in my company truck, which idles alot and was a dog and it seemed to help, I dont think it was my imagination because I was skepical at best, but figured what the hay, its only a buck. Ive used Chevron Techron, Gumout and Valoline with no real noticable performance gains, I usually wait till my fuel milelage suffers and add a bottle to my wifes car and the milelage comes back up, so it does something, wether its cleaning or fooling the computer, I dont know. Try that Dollar tree stuff, its seems to work as good as any. They make a black bottle, injector cleaner, a white bottle, fuel/valve maintence, to be added every tank and a red, octane booster, all just a dollar each, best deal, Ive found yet.